Someone like a Baal Teshuvah who has started doloing mitzvohs and
in most ways is trying to follow Torah and do mitzvohs (not turning on lights on Shabbos, not eating in places that obviously are not kosher studying and learning all they can especially about practical halacha, etc…) but who still might not be doing something because they do not know better,
or because they can’t (like a woman who just decided to follow Torah but has no clothes that are properly tznius, and no money to go out and buy any)
In my opinion, I would still consider them frum (or at least sincerly trying to be), even if they are not yet doing everything so properly.
On the other hand; Someone who knows better and still does things wrong (like one person I knew who was considered to have been the best learner and most knowledgeable about Torah of anyone his age in his neighborhood, but he was also the biggest baal Loshon Hara
I had ever met) in my opinion, is not someone I would call ‘frum’.